When bd init --contributor detects a fork setup (upstream remote exists),
it now configures sync.remote = upstream. This ensures bd sync pulls
beads from the source repo (upstream/main) rather than the fork's
potentially outdated origin/main.
Changes:
- Add sync.remote config in contributor wizard when fork detected
- Modify doSyncFromMain() to use configured sync.remote
- Add getDefaultBranchForRemote() to support any remote name
- Verify configured remote exists before fetching
Fixes bd-bx9
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Co-Authored-By: Claude <noreply@anthropic.com>
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